40-bit Encryption

40-bit encryption refers to a key size of forty bits, or five bytes, for symmetric encryption; this represents a relatively low level of security. A forty bit length corresponds to a total of possible keys. Although this is a large number in human terms (about a trillion, nearly two hundred times the world's human population), it is possible to break this degree of encryption using a moderate amount of computing power in a brute force attack — that is, trying out each possible key in turn.

Read more about 40-bit Encryption:  Description, Obsolescence

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40-bit Encryption - Obsolescence
... All 40-bit and 56-bit encryption algorithms are obsolete because they are vulnerable to brute force attacks, and therefore cannot be regarded as secure ... will not communicate with a client unless it has a 128-bit encryption capability installed on it ... Public/private key pairs used in asymmetric encryption (public key cryptography) must be much longer than 128 bits for security see key size for more details ...