密碼無需對其所有者可見，且不能對他人可見。如果顯示密碼，附近的任何人都能看到該密碼，這會危及系統安全。對于計算機安全性，肩窺指利用直接觀察技巧來獲取信息，例如從某個人的背后窺視。肩窺在擁擠的公共環境中尤其有效。這種威脅主要是針對適用于公共以及私密環境中的移動設備。
[1] Standards Mapping - OWASP Top 10 2007 - (OWASP 2007) A6 Information Leakage and Improper Error Handling
[2] Android Developers-Reference:EditText
[3] Standards Mapping - Security Technical Implementation Guide Version 3 - (STIG 3) APP3210.1 CAT II, APP3310 CAT I, APP3340 CAT I
[4] Standards Mapping - Security Technical Implementation Guide Version 3.4 - (STIG 3.4) APP3210.1 CAT II, APP3310 CAT I, APP3340 CAT I
[5] Standards Mapping - Common Weakness Enumeration - (CWE) CWE ID 359
[6] Standards Mapping - Web Application Security Consortium 24 + 2 - (WASC 24 + 2) Information Leakage
[7] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 - (PCI 2.0) Requirement 3.2, Requirement 3.4, Requirement 4.2, Requirement 6.5.5, Requirement 8.4
[8] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 - (PCI 1.2) Requirement 3.2, Requirement 3.4, Requirement 4.2, Requirement 6.5.6, Requirement 8.4
[9] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 - (PCI 1.1) Requirement 3.2, Requirement 3.4, Requirement 4.2, Requirement 8.4