Basic Idea/Use of Encryption/Decryption 03-25-2012, 02:25 PM
#1
Encryption is the conversion of data into a form that cannot be easily understood by unauthorized people.
Decryption is the process of converting encrypted data back into its original form, so it can be understood.
In wartimes during past, cipher have been employed to keep the enemy from obtaining the contents of transmissions.
Encryption is a good idea when carrying out any kind of sensitive transaction, such as a credit-card purchase online, or the discussion of a company secret between different departments in the organizations.
A key is an algorithm that helps in undoing the work of an encryption algorithm. The correct decryption key is required in order to recover the contents of an encrypted data.
More complex ciphers work according to sophisticated algorithms that rearrange the data bits in transmitted data to make it secure. The more complex the encryption algorithm, the more difficult it becomes to decipher the data transmission without access to the key.
In recent years, a controversy has arisen over so-called strong encryption. This refers to ciphers that are essentially unbreakable without the decryption keys. While most companies and their customers view it as a means of keeping secrets and minimizing fraud, some governments view strong encryption as a potential vehicle by which terrorists might evade authorities. These governments, including that of the United States, want to set up a key-escrow arrangement. This means everyone who uses a cipher would be required to provide the government with a copy of the key. Decryption keys would be stored in a supposedly secure place, used only by authorities, and used only if backed up by a court order. Opponents of this scheme argue that criminals could hack into the key-escrow database and illegally obtain, steal, or alter the keys. Supporters claim that while this is a possibility, implementing the key escrow scheme would be better than doing nothing to prevent criminals from freely using cryptography.
[source : wikipedia (the last paragraph)]
Decryption is the process of converting encrypted data back into its original form, so it can be understood.
In wartimes during past, cipher have been employed to keep the enemy from obtaining the contents of transmissions.
Encryption is a good idea when carrying out any kind of sensitive transaction, such as a credit-card purchase online, or the discussion of a company secret between different departments in the organizations.
A key is an algorithm that helps in undoing the work of an encryption algorithm. The correct decryption key is required in order to recover the contents of an encrypted data.
More complex ciphers work according to sophisticated algorithms that rearrange the data bits in transmitted data to make it secure. The more complex the encryption algorithm, the more difficult it becomes to decipher the data transmission without access to the key.
In recent years, a controversy has arisen over so-called strong encryption. This refers to ciphers that are essentially unbreakable without the decryption keys. While most companies and their customers view it as a means of keeping secrets and minimizing fraud, some governments view strong encryption as a potential vehicle by which terrorists might evade authorities. These governments, including that of the United States, want to set up a key-escrow arrangement. This means everyone who uses a cipher would be required to provide the government with a copy of the key. Decryption keys would be stored in a supposedly secure place, used only by authorities, and used only if backed up by a court order. Opponents of this scheme argue that criminals could hack into the key-escrow database and illegally obtain, steal, or alter the keys. Supporters claim that while this is a possibility, implementing the key escrow scheme would be better than doing nothing to prevent criminals from freely using cryptography.
[source : wikipedia (the last paragraph)]
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